Washington earthquakes

M1.6 earthquake 1 km NE of Riverton, Washington

A magnitude 1.6 earthquake struck 1 km NE of Riverton, Washington on Thu, Apr 9, 1987, 6:09 PM PDT (01:09 UTC), 24 km (15 mi) below the surface.

A larger quake followed: M2.5 1 km NE of Riverton, Washington. This one was a foreshock.

Riverton forecastMore in Washington

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.6 (md), micro
Local time
UTC
1987-04-10 01:09:03 UTC
Depth
23.9 km (14.8 mi), shallow
Epicenter
47.495° N, 122.283° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.3 km horizontally, 0.6 km in depth
Magnitude uncertainty
±0.08
Depth from
From location
Station coverage gap
67°
Stations used
28

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 9 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 2.51 km NE of Riverton, Washington · 14406 days ago · 23 km deep · 0 km away
  2. 1.61 km NNW of Fall City, Washington · 14401 days ago · 8 km deep · 30 km away
  3. 1.619 km N of Packwood, Washington · 14399 days ago · 6 km deep · 94 km away
  4. 2.83 km W of Chico, Washington · 14393 days ago · 20 km deep · 38 km away
  5. 2.11 km E of Algona, Washington · 14379 days ago · 12 km deep · 24 km away
  6. 1.54 km W of Chico, Washington · 14361 days ago · 21 km deep · 39 km away
  7. 2.13 km SSW of Clinton, Washington · 14359 days ago · 28 km deep · 50 km away
  8. 1.76 km W of Burley, Washington · 14358 days ago · 23 km deep · 33 km away
  9. 2.03 km NNW of Ravensdale, Washington · 14352 days ago · 6 km deep · 25 km away

Before

  1. 1.78 km NNE of Snoqualmie, Washington · 14413 days ago · 8 km deep · 40 km away
  2. 2.61 km NE of Riverton, Washington · 14414 days ago · 25 km deep · 0 km away
  3. 2.83 km SSW of Swede Heaven, Washington · 14416 days ago · 1 km deep · 94 km away
  4. 2.27 km ENE of Lofall, Washington · 14423 days ago · 8 km deep · 45 km away
  5. 1.715 km SE of Ashford, Washington · 14426 days ago · 7 km deep · 97 km away
  6. 2.13 km SSW of Swede Heaven, Washington · 14433 days ago · 3 km deep · 93 km away
  7. 1.50 km SSW of Echo Lake, Washington · 14434 days ago · 21 km deep · 36 km away
  8. 2.83 km SW of Swede Heaven, Washington · 14435 days ago · 3 km deep · 93 km away
  9. 1.61 km SSW of Mercer Island, Washington · 14440 days ago · 5 km deep · 8 km away
  10. 2.33 km S of Seattle, Washington · 14441 days ago · 12 km deep · 10 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10217708. Read Wed, Sep 23, 2026, 6:47 AM UTC.